BMW M5 (ECU + exhaust) vs Porsche 911 GT3RS (997) = m5board.com
BMW M5 with Dinan exhaust and chip vs Porsche 911 GT3RS = m5board.com: http://www.m5board.com/vbulletin/e60-m5-e61-m5-touring-discussion/127290-latest-gtboard-supercar-shootout-audi-rs6-lp560-4-997-turbo-997-gt3rs-m5-more.html
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